Circle cutting tool



Dec. 11, 1945. w HUBBELL 2,390,938

cIRcLii: CUTTING TOOL v Filed May 22, 1943 2 Sheets-Sheet 1 Inventor mmzr/mzaezzi Dec. 11, 1945. w. F. HUBBELL CIRCLE CUTTING TOOL Filed May22, 1943 2 Sheets-Sheet 2 Patented Dec. 11, 1945 UNE'E'ED STATES PATENTOFFICE CIRCLE CUTTING TOOL William F. Hubbell, Biloxi, Miss.

Application May 22, 1943, Serial No. 488,081

2 Claims.

The present invention relates to new and useful improvements in machinesfor cutting circles in steel or other metal plates by an oxy-acetylenetorch mounted on the outer end of an electrically operated swinging arm.

A further object is to provide a device of this character of simplepractical construction which is efficient and reliable in use,relatively inexpensive to manufacture, and otherwise well adapted forthe purposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming part hereof, wherein likereference numerals refer to like parts throughout, and in which- Figure1 is a side elevational view,

Figure 2 is a top plan view,

Figures 3 and 4 are sectional views taken respectively on the lines 3-3and 4-4 of Figure l, and

Figure 5 is a perspective view of one of the adjusting bolts.

Referring now to the drawings in detail, the numerals 5 and 6 designateupper and. lower base plates supported in vertically spaced relation byposts 1. Feet 8 on the underside of the lower plate 5 support the baseon the work.

A vertical shaft 9 is journaled in the plates 5 and 6 on which a gear Iis secured. Ashort vertical shaft H is also journaled in the upper plateand also has a gear 12 secured thereto. The gears in and i2 are rotatedin synchronism in a uniform direction by a pinion l3 secured to a shaftI l also joumaled in the upper plate 5 and operatively connected to anelectric motor [5 through a reduction gearing (not shown) in a housingIt on one end of the motor. The shaft 54 is formed of interconnectedsections. The motor is controlled by means of a switch I1.

To the upper end of the shaft 9 is secured a horizontal am ill by acollar l9, the upper surface of the arm having a dove-tail groove 20therein in which is slidably positioned a flared square-shaped head 2!on a bolt 22 rising from the arm.

A connecting rod 23 is formed intermediate its ends with a bore 2dhaving a bushing 25 loosely mounted therein and in which is journaledthe bolt 22.

An adjusting nut 26 is threaded on the top of the bolt to bind the head2| in adjusted position in the dove-tail groove 20 of the arm 18. An arm21 is also secured to the shaft II by a collar 28 and is also formed inits upper surface with a dove-tail groove 29 slidably receiving the headof a bolt 30 in the inner end of the connecting rod 23 secured inadjusted position by an adjusting nut 3|, the bolt 30 being similar inconstruction to the bolt 22.

To the outer end of the connecting rod 23 is secured a standard machinecutting torch 32 by means of a clamp 33.

The arm I8 is provided with grad-nations 34 in inches and fractionsthereof to indicate the adjustment of the connecting rod in the arms.

From the foregoing it will be apparent the torch may be swung in acircle over the Work for cutting the same by means of the swingingaction of the connecting rod 23 through the arms 18 and 21.

It is believed the details of construction, operation and manner of useof the device will be readily understood from the foregoing withoutfurther detailed explanation.

Having thus described my invention, what is claimed as new is:

l. A readily portable circle cutting machine including a supporting basehaving spaced upper and lower plates and adapted to solidly rest on aflat surface, spaced vertical shafts journaled in said upper plate atpermanently fixed points and projecting upwardly therefrom, gears onsaid shafts directly beneath the upper plate, a motor mounted in thebase upon the lower plate, means operatively connecting said motor tosaid shafts for driving them at similar speeds in the same direction andincluding a gear driven by the motor and arranged between and meshingwith the first-named gears, fiat horizontal arms fixed on the upper endsof said shafts, a horizontal I- beam connecting rod having an endportion flatly resting on said arms and provided with spaced verticalbearings at permanently fixed points, vertical bolts journaled in saidbearings, said bolts being carried by and adjustable longitudinally ofsaid arms to correspondingly adjust the connecting rod relative to saidshafts, the other end portion of said connecting rod projectingoutwardly beyond one side of the base, and means on the outer end ofsaid connecting rod to support a cutting torch in an upright positionwith its tip in proximity to the surface on which the base is placed,whereby the machine may be placed on a sheet from which the circle is tobe cut.

2. A readily portable circle cutting machine including a supporting basehaving spaced upper and lower plates and adapted to solidly rest on aflat surface, spaced vertical shafts journaled in said upper plate atpermanently fixed points and projecting upwardly therefrom, gears onsaidshafts directly beneath the upper plate, a motor mounted in the baseupon the lower plate, means operatively connecting said motor to saidshafts for driving them at similar speeds in the same direction andincluding a gear driven by the motor and arranged between and meshingwith the first-named gears, flat horizontal arms fixed on the upper endsof said shafts, a horizontal I- beam connecting rodehavving anendportinnflafly resting on said arms :and provided with spaced verticalbearings at permanently fixed points, vertical bolts journaled in saidbearings, said bolts being carried by and adjustable longitudinally ofsaid arms to correspondingly the connecting rod relative to said shafts.the other end portion of said connecting rod projecting outwardlybeyond one side of the base, and means on the outer end of saidconnecting rod to support a cutting torch in an upright position withits tip in proximity to the surface on which the base is placed, wherebythe machine may be placed on a sheet from which the circle is to be cut,said arms having undercut longitudinal grooves in the upper surfacesthereof, said bolts having heads slidably engaged in said grooves, and21111 115 011 ithe upper ends of said bolts to retain the connecting rodon the bolts and to secure the bolts in adjusted positions relative tothe arms.

WM. F. HUBBELL.

